Yоu аre the SLP in а lоcаl schоol. You have just evaluated Peter and determined that even though he does indeed have difficulty with the "r" sound, he also demonstrates multiple phonological patterns that are no longer developmentally appropriate for a child his age. Therefore, you must explain to Peter's teacher and parents that while, yes, Peter "can't say his 'r' sound," there is more to it than that. Basically you need to explain the difference between a phonological disorder and a single speech sound (articulation) disorder. What will you say?